Well, the production MONTH & year on the VIN sticker may or may not be the actual Chassis No. production date.
Another member's Orange 2L was built a week before mine in Aug. 72, but had a 9/72 VIN sticker date, while mine is 8/72.
Decode your chassis no. on the Karmann plate using an online calendar for the year of mfgr (YoM) noted on the VIN sticker as follows:
Chassis No.: WWD95XX (or...96XX)*
WW = week of year (count even one day as week #1)
D = day of work week (1-5 = M-F)
.... & translate week & day w/ YoM to a full production date
95 = Karmann Plant & * 96 = 95 + 100 added to below...
XX = # of 914s completed/stamped that date (higher # is later in day)
* 96 = 100 + XX = 1XX
COA's are notoriously incomplete & incorrect Tod, so lacking a dealer invoice &/or window sticker, it may be impossible to add the sail/rollbar vinyle, foglights & any other unlisted option items to the COA.
However, at some Parades & other events where PCNA brings their troops armed with their digital microfilm/fische files on computer to the events, you may be able to look at the actual Kardex & jot down the option codes & notations (in German) & get them translated then added to your COA that way (should be at no cost to correct a COA). You might even sneak a pic of it when they're not looking, but they're protective of the Kardexes now due to the fact that it includes the key code and origina/following owner info which is a privacy issue.
As for your interior code #21 - it should read Brown Leatherette with Basketweave (inserts), as per this chart I used to get mine corrected from their erroneous "#31 Beige..." - which was their error....
Click to view attachment ^--- note #21 in bottom left set of English codes, this is from Jeff's website too BTWYou can also pull the option codes off of Jeff Bowlsby's website.
I don't think Froggy was an Appearance Group (AG) 914 - unless it also has the center console, but the chrome bumpers did become a separate option for additional cost over-&-above the AG in the 74 MY so Porsche could ding you 2x for what had been included in the AG for 914/4's in 70-73 MYs.
So the separate chrome bumper option makes sense on Froggy.
FYI - the 74 MY AG would've included Leatherette covered steering wheel & shift boot, loop pile carpet, center console & 3 gauges, foglights/grills & dash switch, dual horns, sail/rollbar vinyl - so if all of that is there, you could look up the code on Jeff's website & take pix of them all on Froggy, then send that into PCNA COA (again!) to ask them to recheck their Kardex & add it to the revised COA.
All I have to say is - it's a good thing that Porsche is not generally as sloppy with the car building, as PCNA is with their crappy COA work, which is usually "neither fast, nor slow - but usually half-fast!" - especially on the older cars without a supplied window sticker!
PS - HEY - cool, they actually have your transaxle number! ...very rare that they have it at all.
PSS - Only the models which included certain or all option groups &/or special options as part of that model's "package" won't include listing those specific options. So a 914-6 70-72 MYs, the 73 early/mid MY 914-2.0/"914S" & 74 LEs won't specifically list their individual options always included with it for the basic price new (911 RS is another non-914 example). I disagree with this approach, because IMHO the manufacturer should be confirming & certifying the inclusion of options on ALL of their models - whether sold at extra cost or included in the upgraded model's base price - for a "Certificate [manufacturer certification] of Authenticity [of all model items and options]".