From what I've seen is Selmer did make a few Altos and tenors beyond what is considered the end of the MK VI but they are rare and far between.Alto 238,XXX
All of the serical number list show this number after the company started the Mark VII - however, this is a Mark VI - was there just no exact cutoff to the number and manufacturing?
I'm outta the club now.289xxx Baritone Low Bb.
I saw tenor MVI # 170327 BIS.84XXX alto . Do you know some mark VI that have letters before de serial number?