The early or 1st version box, the beauty of the first boxes from a collectors point of view is that if one is starting out as a new collector, and hasn't encountered PSR, heard of the Airfix Tribute Forum or never met Eric Williamson's website, they give a complete list of the content on the back, allowing the newbie to start building complete sets from 50p bags, car-booty and eBay graveyard lots.
Eventually the new collector discovers PSR or - eventually - this blog, where he finds all the information needed to check sets. Once he/she has the sets (and boxes if he/she has gone that route), the desire to collect needs stoking with new angles, the first of which is colour variations, in this case only the two were issued by Airfix.
Once this new aspect has been fully sated, the collector will start to seek all other forms of the chosen field, and a lot of these early Airfix sets were issued as premiums with foodstuffs, comics or magazines, in the case of the Farm Animals this was Kraft (now Craft) Dairylea Cheese Spread. These are nearly always in a poor condition as they were firmly taped to the cheese box with a one-inch strip of Sellotape on three sides. I did have a better one, but felt it was greedy to hang on to all three, and made sure the person who most needed it - got it!
The fascinating question is - what does the "OO scale farm buildings and railings simple to construct...." look like? I'm guessing a card item? Maybe the same 'Attack Force' type card once shown in the Airfix Catalogue?
Once the terminal phase of collecting has set in, the collector having convinced themselves that they are embarked upon a task of historical research, of vital importance to the nation and wider world (guilty as charged M'Lud), the aim is to collect anything and everything remotely connected to the original target. Here we see Hong Kong piracies of the Airfix set from several sources, the bags bottom left contain only the Airfix poses, while the animals at the top came with the Airfix Zoo Llama and J & L Randall/Merit horses two shots below. The blue pair bottom right, may be from the bags, but in a different colour, certainly the sprue-release point is the same, while the brown horse, of particularly poor quality (and re-cut tail), comes from a third source altogether and the fluorescent pink Merit-copy cow may be unconnected with the others and appearing on this page under false pretence?
I seem to have taken Preiser/Merten comparisons again! Well I added a couple of HK examples this time, and the Airfix blog is supposed to be a scrap-book format!
Some old images I originally posted on a toy animal-forum, might as well go here too; top image is one of each, full set bottom left and the cream issue to the right.