Viking window channel balances

For the balance you're showing in your photos, our S395-29 should be compatible with this. Take a look and see if you agree. If so, then you can go with a 2810 option. You also mentioned having the same type of balance marked with "26 3". Confirm the metal length measurement of that balance to measure 27". If everything looks good and match up, then you can go with S395-27 with a 2630 option. Please review both parts mentioned and see if these are a match. 

I thought that might be an issue. Since you have two different sized balances in one window, we need to figure out which is the original. To do this, measure the height of the visible glass and add 1". For example, if your visible glass is 14", then you'd want a 15" balance. 

Since you have a 27" balance and a 29" balance between two identical windows, the visible glass height is going to be either 26" or 28".

As for the stamps, that's a simple matter of weighing the sash on a scale and cross-referencing that weight with one of the charts we show on each Series 395 store page. 

Finally, looking at your top sash guide, I recommend our 18-009.