The selected item is a vintage silver-tone letter "M" monogram stick pin (often used as a lapel pin, tie pin, or hat pin). 

Based on the measuring tape positioned directly above the item, the pin has a total length value of approximately 2 inches (or about 5 centimeters), spanning from roughly the 3-inch mark to the 5-inch mark on the tape.

Similar vintage costume jewelry monogram pieces of this style typically carry a collector or resale value between $5.00 and $15.00 depending on the specific buyer, branding, and metal quality