STEP 2: Releasing the pin. Try and do it by not pulling the strap tighter through the buckle and bending the strap over backwards over the buckle. I do this by squeezing the two halves of the strap towards each other (so no bending). R
The 15400 has the 'too small' assemlby line constructed 3120; the 15202, the historic 'JLC 920' assembled by one watchmaker. They are also completely different aesthetics. The stack height of the 2 hands on the 15202 makes it exceptionally elegant. The 15400 more chunky. Good luck.