Knowing your model number is 1A25312HK which i can find comes up as MERCURY 4 STROKE EFI TMC-EU 25EFI EL 4.
I'm not able to locate your 2 numbers offered above here in the USA for a parts catalog but I was able to locate one that's very close to your model number as it offers the same details...Model number 1A25312FL comes up as MERCURY 4 STROKE EFI TMC-EUROPE 25EFI EL 4...
And here is a parts catalog for that number,
View parts diagrams and shop online for 1A25312FL : 2006 Outboard 25EFI [EL 4]. Offering discount prices on OEM parts for over 50 years. FAST $4.95 shipping available.
www.crowleymarine.com
What year is the boat that the engine came on?
Though the website above shows 2006, Keep in mind that Mercury Marine outboard generally stopped using/offering the year models to find parts and other general things starting in 2006... so should your engine be newer then 2006 it will be challenging to find a year model should it not be on the sticker like seen below as anything newer just shows 2006 like seen in the above website, 'in turn meaning your engine is either a 2006 or its newer....Some offer a year on the sticker, and some don't.
Does your serial/model number sticker have a number in the lower right-hand corner such as the following image? (16 in this case)
If yes, then that would be the year of the engine. 2016 for example below.
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