These are quite rare mahjong tiles, a corporate brand featuring the words "Royal Marine" engraved on the 1-pin tile. The pin suit also has a "dolphin logo" engraved on them, and the kanji use a "marine-themed color scheme based on blue," which I find very stylish. The tile size is 25.5 x 18.5 x 15.5 mm. Although these are old mahjong tiles, they are in excellent condition, having only been unwrapped to check the size and weight, and are otherwise unused. I believe these are rare mahjong tiles that are hard to come by. I hope a collector will own them.