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Is this a 3 valve compensator?

Based on how the third valve tubing routes back through the first valve, yes.

The arching leg of the 3rd valve circuit is how you can tell it is a 3-valve comp. 4-valve comps and non-comps don't have the 3rd valve circuit arching over back to the 1st valve for the comp loops (4-valve comps do it with the 4th valve, not the third, which has a straight up and down 3rd circuit like the non-comps, and non-comps are just that - non-comp with the longer straight up and down circuit.)

While on the topic of dirt-cheap Bessons, this looks like a pretty good price for silver plated trumpet, even though it's a student model:

http://www.ebay.com/itm/Besson-1000L-2- ... 1910567485" target="_blank

Headline says 'mint,' text says 'brand new.'

Hup

bloke wrote:I always get Blesson and Bessing confused.

When upon life’s billows you are tempest-tossed,
When you are discouraged, thinking all is lost,
count them, name them one by one.