There's really nothing common about these Common Loons. :)
I'm a Minnesota gal and these have always mesmerized me. Likely, you too. Such majestic creatures.
I made a large, then decided on a super size, to really show off the texture and detail. The super take a super long time, but they're worth it. Shortly thereafter, I removed a little detail so a medium works. :)

Choose individual:
> Medium. Set on 3/8" round shank, design actual 8.9x4mm. (right shown)
> Large. Set on 1/2" round shank, design actual 12x5.4mm. (left shown)
> Super. Set on 1/2x3/4" rectangle shank, design actual 18.4x8.5mm. (right shown)

Choose sets:
> Mirrored set of medium.
> Mirrored set of large.
> Mirrored set of super.
> Stamps shown. (Three stamps)
> All six stamps.

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This one is a surprisingly reasonable stamper. You will want a heavy enough hammer, thick enough metal and/or underlayment to drive out the detail on the Super.
Remember, when I refer to facing, I'm talking about the stamp/tool itself, as that's what you're buying.
Tool steel, fully hardened and tempered to 57hrc /-2, batch tested and verified. Shanks are a bit less than 3" long.
Thanks bunches! ❤