Years ago(20-3-) that's all we used to sell for a leather machine were 7-9 &7-34
they don't feed the best but seem to get the job done most of the time except if you want to reline a saddle the feed system in them isn't good enough to pull it through.
We'd pay 3-500 US for them clean paint put parts,table,motor,reducer & even reverse in them & sell them f/$1,850.00
And at that price we didn't make alot of $$ but sold a bunch of them.
But with the new imports that sew 3/4" out of the box we can't sell them anymore.
Most psrts are still available for them too.
Good Luck!
Bob