Brake booster and master cylinder

[crossram]

I have these numbers on my power brake booster  tabs (202 on the front and 539x on the back). The booster does not have the words "Delco Morraine" stamped on it. Also the master cylinder has the casting number 5468309 and the number D1 by the front bale.
Can anyone tell me if this is correct for a 1967 Camaro and waht the numbers mean?

[Pacecarjeff]

The 309 master was not used untill 69.
Is there a letter code on the "thumb pad" surface on front - Is there a thumb pad surface?