Amazing vintage condition! With legs so thin and delicate, it's amazing that they have stood the test of time without damage. Unmarked, but quite possibly made in Murano, Italy. They are completely intact - ears, feet, tail - I could find no chips or cracks.

Horses are clear glass with amber manes and tails.
The larger horse stands approximately 4.25" tall, and is 4 " long and 1.25" wide.
Medium sized horse is approximately 2.5" tall, 3" long, and 1" wide.
Smallest horse is approximately 2.25" tall, 2.25" long, and 0.8" wide.

Please see photos for details.