I am thinking this is a 395 Series. Stamped with 35DS 48L. I weighed the sash and it weighs nearly 40 lbs. So my thoughts are it needs to be the 3560.
Here is my issue...the top seems to match perfectly, but the shoe is different. The wings are at 90 degrees to the wings on the 365 series. DO you have a shoe like mine? Help, I need new balances real soon.
Photos attached