Help! Moller #75 chairs!  

For value check completed...
For value check completed listings on ebay. Bear in mind location and shipping can be a significant factor. Møllers are also reasonably available on the Internet so you should be able to find an array of asking prices for what that is worth.
And as to age, I am not really sure it matters much unless there is some significant difference in production that you are noticing (I am not aware of any such phenomenon, but then I am far from omniscient).

The stickers were used later,
but in combination with the stamps. Stamps alone are more early production in my opinion.
The seats seem redone and are in exellent condition, good for you!
I have 4 of these in oak, 5 in ebonised oak and own 10 nr 80's all in the same oak. This teak seems very nice and rich in color.

thanks
for both of your comments & sorry for the value question. I'll hold off from asking that in the future.
The set is very nice and the gentleman who sold them to me did in fact have the seats professionally restored.
Unfortunately there is one small chuck of the teak wood that is missing on the front leg of one of the chairs. Any tips on restoration? I would actually need to fill the missing piece with a new 1 inch piece of teak. Is this advisable?

photo please
It really depends on how fixable the problem is. And some people just prefer everything as original as possible, including damaged. I personally like repairing furniture, and have a lot of respect for an elegantly executed repair.

Are those chairs you found for Sale ?
I am looking for a set like that and would buy them if they were avl.
Please advise.
Thanks
Bruce Katz

It is possible to make that...
It is possible to make that repair look quite neat. First you plane down the area where the piece is missing so that you get a nice and flat surface. Then I would find a piece of old teak that matches the color and grain of your leg, make sure it's a bit bigger than what you need and it has one flat surface. Glue the two flat surfaces together with normal white cabinet makers glue, apply a good amount of pressure with a cramp. When the glue has hardened after an hour or so plane down the excess wood to match the shape of the leg and apply some wood oil or whatever finish the chairs already have. Depending on how well you are able to match the grain you should end up with only an unnoticeable hair thin line between the two pieces.
Dunno if this helps