normal pipe size(nps) greater than or equal to 36" double seam is used.
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Seam
The fact it has no edge seam, likely means more technology was used to create the coin. The coin is still a novelty item that has no collectible value. Take it to a coin dealer and see what they offer.
To emphasize seam lines, you can flatten the seam flaps inside the garment and then sew them down on both sides of the seam on the outside of the fabric in contrasting colored thread. Another idea is to add a contrasting trim to the seams of the garment, like rick-rack, braid, or sequins.
The inside seam of a pant leg.
a seam