It sounds like you’re referring to a “Half Set Nickel Silver 15/64 Fly Rod Ferrule NOS”—a vintage or New Old Stock (NOS) component for fly rod construction or repair. Here’s a breakdown of what this likely means:

Key Details:
1. Half Set – Typically means one male and one female ferrule (as opposed to a full set, which may include multiple pairs).
2. Nickel Silver – A durable alloy (copper, nickel, and zinc) used in high-quality ferrules for corrosion resistance and strength.
3. 15/64 – The ferrule size, indicating the diameter (≈ 5.95mm). This would fit a rod with a butt or tip section measuring close to this dimension.
4. Fly Rod Ferrule – The connecting joint between rod sections, ensuring a snug fit for smooth casting.
5. NOS (New Old Stock) – Unused vintage inventory, possibly from an older manufacturer or supplier.

Potential Uses:
– Restoration – Ideal for repairing or replicating classic bamboo or fiberglass fly rods.
– Custom Rod Building – Useful for hobbyists crafting rods with traditional fittings.

Where to Find/Buy:

Half Set Nickel Silver 15/64 Fly Rod Ferrule NOS

– Vintage fishing tackle shops (online or specialty stores).
– eBay, Etsy, or forums (like the Classic Fly Rod Forum).
– Rod-building suppliers (though NOS may be rare).

If you’re looking to sell, buy, or identify these ferrules, checking exact measurements (length, taper) and maker marks (if any) can help determine value and compatibility. Let me know if you need further details!