Impossible to put a value on any bottle without being able to view it's condition, even if the bottling date were known.
You are right in the fact that the distillery closed in 1926 (last bottling was in April), however the distillery was reopened in 1930, and continued to produce Scottish Cream well into the 1950's.
If you would like the have some research done on your bottle, for both dating & valuation,
please forward me several clear photos of the "whole bottle", and close-ups of the top, bottom, and main label.
I should be able to have results for you within 48-72 hrs.
Walter C Hurst