This is another long-lost Glecklers variety (1950s). It is a very productive, easy to grow tomato. You will get lots of baby beefsteak tomatoes. Mild taste, but the tradeoff is its great production and reported drought and disease resistance.
Here is the description of Plamar in a 1950s Glecklers catalog:
A new development from the University of Puerto Rico. A cross of their native variety, ‘Platillo’ and Marglobe. Possess a notable characteristic of setting fruit under extremely hot climatic conditions. Vines are very vigorous, excessive, healthy and extremely rapid in growth. Slightly flattened fruits average medium in size, with thick placental walls. Ripens to a medium red color, possessing good keeping qualities after ripe. Cracks are very limited. We recommend Plamar for Southern States where other varieties do not set fruit under abnormally hot and dry climate. Very resistant to early blight and fusarium wilt.
How to Plant: Start seeds indoors 6 weeks before the last frost. Plant seed 5mm (¼ inch) deep. Transplant after the danger of frost has passed/later spring.