Yes, I've grown it, and actuallly was the first person to introduce the variety by SSE listing it. The link at the bottom notes the history behind it.

All I can tell you is that it's very productive, that may not help much but I don't count how many fruits/plant, nor do I weigh fruits per plant.

A link to Google IMAGES may give you some idea of production, but when viewing such IMAGE pages always put your mouse pointer over a picture to be sure it's the variety you want b'c sometimes some other varieties might be in there as well.

https://www.google.com/search?hl=en&site=imghp&tbm=isch&source=hp&biw=1474&bih=523&q=opalka+tomato&oq=opalka&gs_l=img.1.1.0l5j0i5l3j0i24l2.8611.15288.0.19609.6.6.0.0.0.0.109.594.4j2.6.0....0...1ac..41.img..0.6.594.gm0T3U-6Ctw

Hope that helps,

Carolyn

Here is a link that might be useful: Opalka

Thanks Carolyn, that was indeed helpful. If you say it is very productive that is good enough for me.