No way to even guess without a lot more information. H&R was in business from 1871-1986, and among other firearms, made a LOT of different .32 handguns- and there were different .32 cartridges. See link at bottom of page for some general information on H&R.
Harrington & Richardson did not make a Model 1900. Hopkins and Allen did.
NO. DO NOT ATTEMPT TO DO THIS!!!
25-100
Harrington and Richardson revolver chambered in 32 Smith and Wesson
Blue Book of Gun Values will help.
One of many models made by H&R
Slim to none.
25-60 USD or so
$25-$175, depending on model and condition.
No sn data I know of.
$50-100, depending on condition.
10-130 usd