Shop BASIC Stamps › BASIC Stamp E - 2" Quarter-Square Triangle Image 1 of 1 BASIC Stamp E - 2" Quarter-Square Triangle $6.00 BASIC Stamp E is a triangle 1” in height with a 2” base. Reference marks are included at the midpoint on the base. Get notified by email when this product is in stock. Quantity: Add To Cart Added! BASIC Stamp E is a triangle 1” in height with a 2” base. Reference marks are included at the midpoint on the base.