I Don't know what a reasonable value would be on this gun, it's just that uncommon. Whatever you do ask them to hold it, Don't even try to bargain or negotiate. But Do maintain your composure and find a way to raise that $1900. The gun looks good, bright blue finish - doesn't look refinished, Red ramp front sight, not the common satin blue like a model 28, a 3 maybe 4 screw frame. A true model marked 23 is a gem of a find a real keeper but if you choose to flip it at a tidy profit I would understand.
When I was a young collector & in your financial position I never had an opportunity like this. It's exciting to watch this unfold. Best of Luck to you.