I'm not sure when it happened, and I'm far from a Lotus historian, but it seems that sometime during the Europa production run the Lotus badges changed from black/silver to yellow/green. Sometimes when parts or accessories are sold with a Lotus badge on them you have a choice of colour combination (presumably to coincide with the year of your car). Having said that, my mostly original 74 Europa has a yellow/green nose badge, but the steering wheel badge is black/silver... yeah, I guess I'm confused, too. Hopefully someone with actual knowledge will chime in here.
It also seems that the actual year of manufacture of many of these cars does not match the year they are titles as. My car was built in the first half of 73, but was titled in 74 and is therefore called a 74. I've heard stories of S2 Europas titled well after the release of the Twin Cams, even though the S2s were built earlier, and therefore officially became, say, a 72, though they may have been built in 71 or 70. If your car was built in 69, it wouldn't surprise me that it was first titled in 71, and is therefore referred to as a 71 from there on out.
What I really wanted to comment on was the suggestion regarding a proper restoration (and by restoration I mean returning the car to original specification and condition) on your car. If you have a strong desire to restore a Europa, start with a complete car. Restorable Europas are very reasonably priced and decent ones are out there. The time and money spent scrounging bits will quickly add up. Your car is a very interesting project, and I realise your frustration with your Europa is building up, but from what I've read about your car I would think that it is not a good candidate for a proper restoration. However, your Europa is a very cool project that unfortunately got bodged somewhere during the process. I believe the job of getting your car on the road will be made much easier if you are not limited to confines of specification set forth by Lotus at the time your car was built. Things like switches, wiring, gauges, plumbing, etc, if it seems dodgey or suspect, should just be ripped out and replaced with locally procured auto parts store replacements, or whatever it takes to keep your project moving forward. You have a cool project there, and I'm anxious for you to get it moving under its own power. What you really need right now is a success or two in your efforts to make this happen, so as to renew your vigor and inspiration. I'm wishing you the very best of luck in doing so. Cheers