Generation 1 or G1 as they're commonly known as are some of the first run of the plastic pony toy line. They are notiably large and are usually made with a softer plastic.
Not all the ponies are large in G1 there were a line of baby and fairy ponies.
A custom g1 can be a bit pricey because finding the base pony has become more difficult. I only have a limited supply at any time.
If you're able to provide the bait/base pony, I'm able to offer a discount. :)