100-1000 depending on specifics. You don't mention when you bought it.
1960; 20-1000 usd
There is no S&W Model 150
1950-1969 for exact information, it is worth the price to get a factory letter from Smith & Wesson
1965; 50-600 usd
100-1000 USD depending on EXATCLY what you have and condition.
Well since that seems to be the serial number on my model 10 revolver, it's worth $269.00. That's what I bought it for.
Without a specific model number and serial number the range is 50-7000 USD
model and overall condition needed
introduced in 1954 in excell cond. worth about $400.00
No serial number given.
100-450 USD or so. Standard Catalog of Smith and Wesson, 3rd, ed has sn data.
20000