Hartzell Propeller Spinner C-1904-3 Click here to purchase or contact the seller of this item on eBay
Current Price: 399.00 USD

As shown, as is: a Hartzell Two Blade Propeller Spinner Dome.

I believe this is a Hartzell Propeller Spinner Dome P/N C1904–3. 

The diameter is 12 inches at the base, as shown. 

Please examine the photos carefully, since I don't accept returns. 

Be certain this fits your application. 

Also would be a suitable decorative piece.

Used on many Cessna 172, 182, Piper PA-28 aircraft.