Welcome to the forum. WE are glad you stopped by.
You will need to post pics to get any type of accurate assessment. The model 37 at 100% condition is rated in the
Blue Book of Gun Values by Fjestad at $450. Very few guns are ever in that condition that are used.
Guns are worth what someone will pay
The holster and loading tool (I assume you mean speed loader) Have intrinsic value aside from that of the gun. I hope this helps. Pics are your friend. Lot's of folks here will help if you post them.
BTW you can sell it on the sub forum Firearms for sale. make sure you read all the rules 1st. Good luck
Oh dates to very early 1970's
Mike