There is a type of fungal after-effect that resembles your detail pic, but it never appears with that tell-tale ragged mottled pattern: it always manifests as concentric rainbow-shimmer circles or spots. A couple test rolls in contre-jour light should allay (or confirm) any lingering concerns. Just use a hood, which you would need in any case, and it should be fine. So if you come across another Rolleiflex in this price range with minor patches of this particular coating defect, it may not have an impact on anything but future resale value. This type of coating anamoly doesn't have much of an impact on performance (the f/2.8 flares like the devil even with perfectly intact coatings), and I've owned far worse examples of Hassy 80 Planar C with nearly the entire front coating rubbed off, or heavy fungus, that worked surprisingly well. Ten years ago $800 might have bought you a 2.8F without such coating issue, today you'd have to spend over $1K, probably more. It seems unsightly from certain angles, and certainly isn't desirable, but its par for the course with "affordable" examples of sought-after vintage Zeiss glass. More often its an indication of coating decay, or coating wear from cleaning over several decades. Just for future reference, in your second lens close-up pic above: the "mottled" (for lack of a better term) area highlighted near the engraved "80mm" lettering is usually not fungus-related in my experience with similar-era Zeiss lenses made for Hasselblad. Some will disagree, but not to worry- I've got my Nomex underwear on. BTW, in a pinch, plain blue glass cleaner works just fine. If you breath on a cool lens, the pattern as it evaporates will tell you how clean you got it. Hoya filters were some of the worst to clean, but micro-fiber makes it easy. Some people dislike them, but I've never had a scratch and they can eliminate streaks that were almost impossible with tissues. I wash my micro-fibers by hand and lay them out to air dry. These days I use some Zeiss lens cleaner on a cotton ball and finish with my breath and a micro-fiber cloth. ROR (residual oil remover) is OK, but I never use it. Now you can be slightly more aggressive with lens tissue or a clean micro-fiber cloth. Use a second ball to finish this first stage. Roll the cotton ball as you do it to pick up any dirt. Float it around the lens, but not with so much cleaning solution that any can get under the retaining ring. Use the water-based cleaning solution of your choice and dampen a ball. You start with a bunch of clean cotton balls. I use a method recommended by the Questar telescope company many years ago for their corrector plates. That first thing has to remove any abrasive particles that could scratch the lens during the next steps.
There are about 100 ways to clean a lens but IMO the first thing you do is the most critical. Coating looks a little mottled, but not serious.
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