Identifying channel balance size, series 380

Question

Trying to identify my size. I have two different window sizes.
1. Balancer identifying marks 27 1/2 3 A I Metal measures 28 1/2"
2. Balancer identifying marks 29 3 J H Metal measures 30"
I have identified the series by the samples on this site.
Can you tell me the correct items to order?

Tom · Accepted Answer

Our balances measure on the full inch. I am not certain whether the 28 or 29 inch balance will work for the first balance listed.

Please list the sash weight so we can recommend a stamp option (remove the window sash and place it on a scale to determine its weight).