If the gun is complete and functional, $300.00 to $800.00 depending on the condition.
100-1000 USD or so depending on EXACTLY what you have.
A detailed description of all markings, condition, finish, barrel length, caliber, box, accessories, etc., is need to answer the question.
Firstly, value depends on a number of things; a) General condition of the revolver, b) Where you are in the world, local rarity can increase values as can local gun control laws (conversely decrease the value) In Australia, Webley Mk VI average from 450 AUD for an average condition through to 1200AUD for an excellent example. Bear in mind that a .455 Webley is strictly regulated in Australia and is limited to collectors and others who can obtain a restricted hand gun license in Australia, an average sports shooter cannot. Thus values can fluctuate, average cost would be around 500 AUD.
50-200 USD
The price of a Webley & Scott Mark IV .38 revolver can vary significantly based on its condition, age, and whether it includes original accessories or documentation. Generally, prices can range from around $300 to over $1,000 for well-preserved examples. For the most accurate pricing, it's advisable to consult recent sales or auction listings specific to your region.
The value of a Webley Mk IV .455 revolver can vary significantly based on factors such as condition, rarity, and historical significance. Generally, prices can range from around $300 to over $1,000, with well-maintained or rare models fetching higher amounts. It's advisable to consult recent sales or a firearms appraiser for a more accurate assessment based on the specific revolver in question.
10-1000 USD depending on speicifics
How much does 5 mark-1937 cost
Without more information about the condition of the pistol, it is not possible to give you an estimate of value.
100 or so
50-100 USD Another Answer: Depending on the condition I've seen them sell for over $3000
I bought one at auction for $150