This is a new Marine Band Deluxe harmonica in the key of Db
The following is from the hohner.de website:
THE STATE OF THE ART – BACK TO THE ROOTS

With the Marine Band Deluxe, we’ve brought the incomparable sound of the original blues harmonica into the 21st century. By incorporating design improvements which optimize handling and ensure greater volume and faster response, we reinvented the legendary Marine Band harmonica to meet the requirements of today’s musicians. The Marine Band Deluxe is more than just a state of the art upgrade to our benchmark diatonic harp. It’s the rediscovery of deep emotions, the awakening of forgotten spirits, the revival of hidden energies. With the Marine Band Deluxe, you’ll bring the blues to life!

Reed plates (material, thickness):brass, 0.9 mmReed plates (surface):brassReeds (number, material):20, brassComb (material, color):pearwood, brownComb (finish):triple lacqueredMouthpiece (surface):pearwoodCover plates:stainless steelKeys:F, E, Eb, D, Db, C, B(H), Bb, A, Ab, GType:diatonicTuning:RichterNumber of holes:10Tonal range:3 octavesLength:10 cm / 3.9”