Hi again codeman, Scott Bonnar often riveted one tag over another...you will probably find the top one is the Serial number of the machine and the bottom one is the Model number. I can't make anything out from the pics.
This is where it gets interesting, the bottom tag is aluminium alloy and a later tag than the brass top one....which means this machine is probably manufactured somewhere between late 1970 -73.
Can you please post the
complete string of numbers stamped on the air-cowling of the Briggs...This will allow us to confirm the exact date of manufacture of the engine.
The machine itself looks in very good order and would restore beautifully.
Some questions for you....
(1) Are you going to use it on your own lawn?
(2) What machine do you use to mow your lawn with?