Gretsch Strainer/snare Butt Combos

[OldSchool]

Do any of you Gretsch experts out there happen to know what determined whether a Micro-Sensitive Strainer was matched up at the factory with a one-point or four-point snare butt?Help2

Was it the particular model of snare drum, the year of manufacture, both, or some other factor or factors?

Also, was the Micro-Sensitive strainer mounted to the shell with three screws?

THANKS in advance for your time and your help.

Happy Holidays!

[royal ace]

The micro is attached with two bolts and an inner shell plate. The third hole is for the tension adjustment screw cylinder.
I believe the one-point butt was superseded by the four-point butt around 1959-60.