Hi Dijon,
I have no idea about the value of these parts but I used to own H.L1067, in .22...I think the actual designation was "Huntsman Low", hence the "HL" in the serial number, think mine dated from sometime around the early-mid 80's and, to the best of my knowledge, it is still going strong accounting for rats on a mate's smallholding.
It was heavy, the one-piece trigger was a crude single stage affair...pivoting around it's middle with the top of the trigger acted like the sear bearing straight onto the hammer!...and the stock and breech looked like they started life on something else...but I did love that gun!