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I bought this BBb almost a year ago. Plays fine and does the job but I’d like to know more about it. The previous owner didn’t know too much (he thought it may have been from the late 1960’s early 70’s).
I can’t find the serial number on this instrument. Each rotary valve is stamped with a “67”. And the third valve has an “S” stamped below the “67”.

3135 IS the serial number. Miraphones in the last several decades have had the serial incorporated into the bell logo. The numbers you see in other places are just 'build' numbers.

When I replace a bell on a Miraphone I stamp the original serial number into the paddle bar along with the date I rebuilt the horn plus my initials.

That looks like a model 186 tuba in BBb to me.
According to Horn-U-Copia, that serial # dates to 1966-67. http://www.horn-u-copia.net/serial/mirafonelist.html

I don't know anything about the 67 stamp on the valve.

Thanks, everyone!

I believe the "3135" is the serial number of your tuba.

I've had great luck contacting Miraphone through their website to date my horns. With the serial numbers from my 188 and 291, Miraphone sent me all the pertinent info I was looking for. It may take a day or two for the reply, but Miraphone has always got back me.

I don't know if they will have records that go that far back but it's worth a try.

Good luck!