Can't be done without a detailed description of all features and overall condition at a minimum
Meriden Firearms, 1905-1915, was a subsidiary of Sears Roebuck. Probably not real ivory, but could be. Value depends on condition, but probably not over $150 in excellent condition.
10-100 USD or so
No sn data in the public domain. Meriden Firearms Company was in operation from 1905 to 1918.
Value is highly dependent on condition, and the pearl handles or engraving may or may not affect the value. In "very good condition", a Meriden revolver is worth about $400. But it "good" condition, it is down to $150. $75 for "fair" and $50 for "poor"
Any that have the appropriate sized barrel
Howard Arms was a trade name used by Sears Roebuck on revolvers made by their subsidiary company, Meriden Firearms Co., from about 1905 to 1915. The only "model" designation would be the caliber, .38 or .32.
HOWARD ARMS CO. Tradename used by Meriden Firearms Company (1905-1918) on revolvers. Meridan was a subsidiary of Sears Roebuck and produced firearms for sale through their catalogs and retail stores.
Not if you won't tell us the make and model. More than one company made firearms in 38-55 caliber.
10-100 USD or so
.38 caliber firearms have been around for a long time- several muzzleloader, and cap & ball revolvers used that caliber (Colt Navy models). The .38 rimfire was created about 1861, and was followed by the .38 Webley, various .38 Colts, S&Ws, etc. The most common .38 cartridge today is the .38 Special (which is actually .357, not .38) It was created by Smith & Wesson in 1899, and is still in production.
Library, Blue Book of Gun Values, Standard Firearms Dictionary.