Can't be answered without a DETAILED description of ALL markings, barrel length, finish, grips, sights, box, accessories, papers, condition.
Impossible to answer without the serial number. The serial number should be on the butt.
You did not provide the serial number. You will have to call S&W to find out.
Impossible to answer witout a DETAILED description of ALL markings, features and condition.
50-100
It is any number of the form (38s*k)/k where k is a non-zero integer.
actually you can use 38 special or 38S&W (shorter case), but you cannot use 38 special in a 38S&W pistol. in your case 38 special
The coordinates 38S 145E correspond to Melbourne, Australia.
2,19
Unforunately, just the serial number does not give us much info. Serial numbers are NOT unique- more than one gun bears 3635- and H&R made thousands of top break 38s- in dozens of different models. Link below can give you some info- read all the way to the bottom for some of the model info.
RG firearms were typically low cost/low quality items. Depending on model and condition, these may sell for $25-$75.
3/8 = 0.375
@ 50 USD or so