Heller yes?  

bobbob,
I have included three different back stamps for Massimo Vignelli Max plates and bowls for Heller. There are a few others.
Your color matching flatware was not made by Heller.
I have a few hundred pieces of Heller, and while I am not an expert, I do not know of any such flatware. I would suggest that Heller is a customer friendly company (up to a point) and I am sure would be more than happy to answer your question. Contact the source...

Did you see this 1987 NYT article mentioning Oak Hill?
http://www.nytimes.com/1987/06/18/garden/disposable-tableware-shows-just...
Last year, the Cooper-Hewitt Museum chose for its permanent collection Oak Hill's 88 Party Case, which holds 88 pieces of plastic tableware and cutlery. ''One of the areas I am aggressively collecting is plastic and cutlery,'' said David McFadden, curator of decorative arts, ''and this was pertinent from both points of view - material and function.''
I'm guessing Oak Hill matched the Heller colors on their own, figuring people would want flatware to use with their picnic sets. If so, smart move.
I've seen tons of Heller dishes over the years and a few times there has been flatware with it that wasn't marked Heller, as I recall.

Spanky,
I am a plastics fan.
A great may people made interesting plastics in the 70's. The Louis Kasen melamine dinnerware for Peter Pan Industries is a great example. The plates are a "dead ringer" for Ingrid Ltd Chicago and the bowls are a copy of Heller. I thought the colors were just too cool.
Thank you for the article referencing Oak Hill Industries Corp.
Can you believe no monotonous repetition of outdated pop culture references and unnecessary rudeness containing zero insight. What a shock.

Bobbob- not sure when your plastic flatware set was made. Most of the flatware sets purchased by the original owners that came along with the vintage Hellerware (originally by Articoli in 1964 and later by Heller) I acquired over the years were made by Lauffer in either all plastic or s/s with plastic handles. The all plastic set by Lauffer was stronger and were not marketed as disposable. The set was kid friendly and are less likely to leave scratches on a melamine surface. The second set although cool looking tends to leave scratches like regular s/s flatware.

minimoma,
I am sure you are aware of Heller Italy between the Articoli and the usual Heller (USA). I have included the marks from my Sergio Asti ice buckets. The only Max coffee cups and saucers for Heller I have seen are the six I own and they are marked Heller Italy (same with the cream and sugar although I believe these may have also been made in the us).
They is a great amount to collect with Heller (I like the pitchers). It is, for the most part, inexpensive and easy to find.

The earlier cups had spill issues where the handle meets the top rim was an open half round and was closed off on later mugs. It made sense on the design of the pitcher where orienting the indentation on the lid determines if the spout is open or close. Niceguy I also like the pitcher's overall design. The two finger grips (?) on the big Heller bowls cover tend to slip though when l have wet fingers and same with the ice bucket by Sergio Asti. The ice buckets are great for storing rice, flour & other stuff in the kitchen in style.

minimoma,
You are of course correct. This is the Max II production. The design modification was early in US production and became known as Max I.
I have limited use for an ice bucket. I prefer (also part of my collection) the Ingrid Ltd Chicago melamine ice bucket (another poorly designed finger grip top).
The Heller lids on the storage containers finger grips seem small. It serves a purpose as part of the Max bowls, plates and tray set to hold the salad plates. These trays are somewhat more difficult to find (I have three as compared to a dozen or more large round trays).
For storage the Massimo Vignelli glass canisters with plastic lids are ideal. I find a great many white, and handful of yellow and two red units.
Lella Vignelli appears to be credited with the oven glassware for Heller. These are truly 100% form equals function. Later authorized production was continued under the Glasbake name by Jeannette USA for The Chef's Choice. I have no idea of any dollar differential between the Heller and Chef's Choice pieces, I continue to purchase all this and more when the opportunity arises.

Nice collection Niceguy and thanks for sharing the Heller/Vignelli stuff.
This is the Sergio Asti large ice bucket/wine cooler(?) for Heller that I have and use in the kitchen for storage. I acquired several of them mostly in white to go with the early Gino Colombini stuff for Kartell and other Guzzini stuff. Sometimes I will pick up the unmarked color ones if they are just being ignored at the thrift stores by fickle collectors. They just make the kitchen look less like a kitchen when they are on the table/counter as storage.
I don't have an image at the moment, but sometimes I display the Vignelli Hellerware at home stacked either in single color or multi alternating colors (pitcher, plates, bowls with lids, etc.) to look like one of those Ettore Sottsass totems.

minimoma,
I had these two additional Lella Vignelli glass bakeware for Heller technical sheets you may appreciate.
I also have a great amount of Gino Colombini for Kartell and Ettore Sottsass for Guzzini (Sottsass Associati Bella Vista storage jars and other kitchen items). I enjoy and collect limited ceramics by Sottsass for both Memphis-Milano and Edizioni Arte Design.
I just enjoy collecting everything.

niceguy-
About a year ago the Vignelli Archives did some research on those glass jars with the plastic lids. Their source at Heller ws able to determine that Vignelli was not involved with their design. They were designed in house by the Heller team.
http://vignellicenter.tumblr.com/post/109317870067/heller-storage-jars-i...
Really great looking and functional, though!

scottlindberg,
I read with great interest and I am grateful for the information you provided confirming the designer identification of these Heller storage jars.
I will correct all my inventory information for this item. Thank you.