Looks similar to my hull it's hard to tell without pictures of the rear or anything, mines a 1970 Sleek-Craft 19'
Mind you I've never seen another one of my hulls EVER, I saw one for sale outta state a few years ago and it was a closed bow also.
You can tell it's an earlier hull I believe cause it's rounded in the rear, typically style for 1974 and earlier
Could be that it's such an early hull like mine before the HIN's were stamped on the rear, also it looks like that
"open bow" was home made or something not sure
Sent from my iPhone using SoCal