Perfect gift for a 40th birthday! I have hand stamped a heart around the date on the 1984 penny and "40 & Fabulous" along the bottom of the back aluminum piece.
I use a real copper penny, so it will tarnish over time as any penny would do. Aluminum is a great alternative to the stainless steel. It will not tarnish or change colors and has a lighter weight than stainless steel.
Due to the hand stamped nature of each piece, being stamped one-letter-at-a-time, there may be slight differences in letter placement and spacing. This is not to be considered a defect. The differences are what gives the unique character to each piece.