Lead pipe/shank size question

[bububassboner]

Good day,
I have been talking with a German guy about his tuba he has for sale ( in German, my brain hurts) its an old GDR era symphonie in gold brass with the bell kranz and a left hand thumb operated fifth valve. I asked him if it is tuba shank or bass trombone shank and he didn't know. Is there any good way of telling what shank it might have before I get out there?

Thanks in advance

[TheHatTuba]

Does it have clock or spiral springs?

[bububassboner]

Does it have clock or spiral springs?

Clock springs. Though they were redone by B&S in 2006. I'm surprised they didn't change them out then.

[bububassboner]

...so I wouldn't let a small shank receiver on a GOOD B&S Symphonie F tuba keep me from acquiring it.

Oh I wasn't gonna let that stop me. I don't have a small shank mouthpiece so if it is small shank ill need to get one.

Do you make a small shank solo mouthpiece?

[Donn]

To my eye, the small end of a small shank is 12½ mm, where a US standard is a full 13. The distinction is within most people's measurement tolerances, I think.

If you're really talking "bass trombone" shank, that's a little larger, but still visibly less than 13 mm.