Here's why:
* "bc my luck" marking: This is unusual and needs further investigation. Is it a personal inscription, a dealer's mark, or something else? Its meaning significantly impacts value. A simple personal inscription lowers value, while a unique marking by a known gunsmith could raise it.
* Miroku Engraving: Miroku is a reputable Japanese gun manufacturer, known for making shotguns for various brands. The presence of Miroku's name suggests it's a high-quality gun, but the *style* and *location* of the engraving are key. Pictures would be invaluable here.
* Serial Number: While the serial number helps trace the gun's history and age (potentially helping date it), it doesn't directly determine value without more context. A gunsmith or appraiser with access to Miroku's records could use this.
* Condition: The overall condition of the shotgun (wear, scratches, functionality, original case, etc.) is paramount to determining value. A pristine gun in perfect working order is worth considerably more than a damaged or poorly maintained one.
* Demand: The value also depends on current market demand for similar models and condition. This fluctuates.
To determine the value, you should:
1. Take clear photos: Photograph the entire shotgun, including all markings, the action, the stock, and any other features. Close-ups of the "bc my luck" and "Miroku" markings are essential.
2. Consult a gun appraiser: Contact a qualified firearms appraiser or a specialist in Japanese shotguns. They can provide a professional opinion based on a thorough examination. Look for appraisers with experience in valuing antique or collectible firearms.
3. Check online resources: While online resources are helpful for general information, they shouldn't be relied upon for precise valuation. Sites like GunBroker may show recent sales of comparable guns, but these are not guarantees of value for your specific firearm.
Without a proper appraisal, any price given online would be pure speculation. The rarity you've been told about needs verification from a knowledgeable source.