ga productions postcards

[RMA179]

Can anyone assist in the identity and any additional info on the fairly modern postcards published by "g.a. productions, P.O. Box 28, Sandy Bay, Tasmania. 7005" (printed on back).
I assume "g.a." are the initials of the publisher/photographer. Views are, unusually, all in vertical format and are numbered in lower right corner at back from ga101 to the highest seen ga160. There are some with no numbers. I only have one dated card being ga158 showing Sydney-Hobart yachts in Constitution Dock with pictorial postmarks (but not posted or addressed) for the Tasmanian Fiesta run post Sydney & Melbourne to Hobart yacht races dated Jan 1 1983. The views show scenes and animals from every state & territory of Australia not just Tasmania. Have attached images of front & back of ga101.