HTC × Birkenstock × Standard California Boston

These are Birkenstock custom sandals from HTC, purchased at Standard California approximately 15 years ago.
This model is no longer in production, so it is likely difficult to find.
I don't recall the purchase price, but I believe it was around 40,000 yen.
Original box not included.
Self-cleaned for this listing.
Shipping will be done using recycled materials and packed compactly.