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For a Squall you would need to contact Boston Whaler as bmw90 states.

You can get some info on other members with Squalls on our members boat info page.
Order by model at the top of the page and then scroll down to Squall.
http://www.whalercentral.com/boat_lis...st/bl1.php

For all other models you can decipher the Stencil and HIN Information from our article here:
http://www.whalercentral.com/articles...icle_id=61

Also see the members boat model count here:
http://www.whalercentral.com/viewpage...age_id=163

I would guess that your number 05438 would make it a 1970 year model.
But that would just be a guess.
http://www.whalercentral.com/viewpage...age_id=197