Yes- and that was the earlier 253-6.
Sorry about short-circuiting the nomenclature - those numbers all mean something. 253-6 is a Mod O.5 non-tower 25:1 1/4” axle gearbox. The 653-6 is roughly the same but Mod O.6 gears, 24:1, and ball bearing worm.
They have easy to understand product ID. The third digit is axle diameter.
I personally never, ever use the tower gearboxes.
Good products. I hope they continue.