Here is a type showing of this series, including some "rueda de carreta" specimens, two covers, and a piece. There are three papers: watermarked loops, watermarked cross-hatch lines, and unwatermarked. The cover shown below bears a 4 cuartos stamp with watermark loops from Santa Cruz de Mudela, Ciudad Real, to Madrid. Quick links: types / rueda de carreta (wheel barrel cancelers) / two covers and a piece

Below is another 4 cuartos cover (also watermark loops) from Baleares to Madrid.

Below is a pair of the 2 reales value watermarked loops on piece.