We all have them.  How about the Hawk of the Great Outdoors.  Here is my take of the Mercury Mico 1 Mushroom Collecting Knife.

The Mercury Mico 1.

Comes with small tweezers,  attached boar's hair brush, and instructions on use. Knife arrived in nice clear plastic case with red lining.  It makes for a very nice presentation if you were to consider gifting it.

Tweezers fit snugly in the top of the knife.

The 4 centimeter ruler is well marked and doesn't rub off

The blade is the sharpest I have encountered on a Mushroom knife

Specifications

Made by:  Mercury

Pattern:  Mushroom Knife, Mico 1

Place of Manufacture:   Italy  (Maniago, Italy)

Length, Closed: 5.5 inches (14 cm) w/ Brush  -- 4.5 inches (11.4 cm) w/o brush)

Brush:  Boar's Hari, 1 inch (2.5 cm)

Blade:  Modified hawkbill with mushroom cleaning spine 

Blade lendth: 2.75 inches  (7 cm)   2.25 cutting adge (5.7 cm)

Steel:  440A

Liners:  Stainless Steel

Pins:  Brass

Handle:  Treated Olive Wood, 4 CM rule stamped in obverse scale

Bail:  Attached swiveling chain w/ iclasp hook.

Other Notes:  Stainless steel Tweezers fit in handle near top.