So is their appearance on eBay. This one just sold at auction with 11 bids. The seller doesn't include the year, but judging by the color and lack of "VFR" decal it would say it's from a pearl white 700 F2.
If you're searching for one of these, be aware that there's one more subtle difference: near the seller's thumb in this photo, there's a locating tab on the earlier "F" models which inserted into a slot in the tail light fairing. The later production bikes didn't have the tab or the slot. These cowls often have a crack at the rear (center) locating tab, or it's missing altogether. That's a critical tab and difficult to repair with any semblance of strength. Another crack-prone spot is at the downward curve near the bum-stop. The bum-stop colors match the various seat colors, so that's another thing to look for. Chuck Crites (aka VFR Chuck) made a run of these as reproduction parts in heavier but stronger fiberglass so you may come across one of those in a generic gelcoat white color.
Pictured below are an OEM cowl on the left and one of Chuck's on the right. Both have the extra mounting tabs. Looking closely at the OEM piece, you'll see I've made repairs to a crack near the bum-stop and have reinforced the central tab on the underside. Click on an image to enlarge.