Question on '68 C20 RPOs

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My Grandpa's truck more specifically. And no, I don't have any pics of it just cuz I've never taken any. Buuut, I dug the build sheet out of it that we had stuck in the glovebox after installing a new seat cover a few years back. Just wanna know if there's anything interesting about it. Mainly the fact that the "SCHED NO. DATE" is 2-29-68 and it has the "551 Ivory/Gold" and "625 Parch Cloth Trim". Does this mean it's a 50th Anniversary that was built on Leap Year Day? That would be kinda cool lol. Is it even a 50th though?

The RPO codes are as follows-
A10 - Panoramic RR wdw
B98 - Side Trim Moulding
D32 - LH Short Arm Mir
D34 - RH Shrot Arm Mir
F53 - HD Frt Shocks
F59 - Frt Stabilizer EQ
F60 - HD Frt Springs
G50 - HD Rear Springs
G70 - Rear Leaf Springs
J70 - Vac Brake Booster
L30 - V8 Eng-327 Cu In
M20 - 4 Speed Trans
M40 - Hydraulic Strg
R67 - F750x16x6 N T
R68 - R750x16x8 N T
U63 - Pushbutton Radio
Z53 - Amp-Oil-Tem Gaug
Z62 - Custom C&C Equip
Z81 - Camper Equip
551 - Ivory/Gold
625 - Parch Cloth Trim

Now the story goes, an older guy special ordered it to tow a trailer back and forth to Arizona. It was delivered to Weiler Chevy in Oregon City, OR. At some point he put big towing mirrors on it along with a white boat carrier type shell on it. We've replaced the mirrors but it still has the shell on it, still has the winch and everything hooked up matter of fact. He eventually had an automatic trans which still shifts very hard so it must be setup to tow. My Grandpa bought it about 5 years ago in very good shape other then 40 years worth of patina. Someday it'll be mine at which point I'll have both of my Grandpa's trucks (as in my mom's dad and my dad's dad).

So whatcha think? And I'll try to remember to get some pics next time he comes down.