The Hull Identification Number (HIN) will give you this information.
USCG HIN References:
Hull ID Numbers - BoatSafe.com
USCG MIC Reference:
Manufacturers Identification
HIN Format:
<MIC><Serial Number><Date of Certification><Model Year>
======================================
MIC = Manufacturers ID Code
Maxum MIC's;
MIC.Company.........Address....................... ....City............State
BVK MAXUM MARINE 17825 59TH AVE NE...........ARLINGTON WA
MXK MAXUM MARINE 17825 59TH AVENUE NE ARLINGTON WA
MXP MAXUM MARINE 17825 59TH AVENUE NE ARLINGTON WA
MXR MAXUM MARINE PO BOX 9029 EVERETT WA
MXY MAXUM MARINE 1 NORTH FIELD CT LAKE FOREST IL
XNC MAXUM MARINE 17825 59TH AVE NE ARLINGTON WA
======================================
The Maxum Serial Numbers are typically only 2 character numbers.
I only have records back to 1993.
======================================
Date Of Certification:
Format: <Month><Day>
example: Jan 3 = A3
Jan = A
Feb = B
Mar = C
April = D
May = E
June = F
July = G
Aug = H
Sept = I
Oct = J
Nov = K
Dec = L
======================================
Model Year format: <YY>
example: 97
======================================
HIN: USKF23MAF989
USK - Bayliner
NOTE: The first few years after Brunswick acquired Maxum, the boats manufactured in Bayliner facilities were assigned a Bayliner MIC because hadn't obtained a MIC for Maxum in that specific plant yet.
Serial #: F23MA
NOTE: I only have records back to 1993. I have no idea what model this is. I would have guessed a 23 footer based on the designation.
Date Of Certification: June 1989
Model Year: 1989