Old decks of playing cards often don't have corner indicators for suit and number, and it seems hard (at least to a novice) to determine what each card is without seeing it in full. For instance:
This is an Italian deck, but other old ones I see are similar. I normally hold cards more or less like this, with only the corner digit and suit visible:
This does not seem possible with old cards. Were there any techniques for holding a hand in such a deck such that the cards are easily identifiable?