Interesting,
My 250 SL does not have an engine number on the block, which apparently is normal for a replacement engine,
the original engine number from the data card was 129 982 22 000914, but the Registration
documents have shown a number with one less digit 129 982 22 00096 for at least the last 40 years.
I notice both your replacement engine numbers also have less digits.
Enjoy the sun, hope it remains for the European trip.
Paul